Unzipped graphene nanoribbons as sensitive O2 sensors: Electron spin resonance probing and dissociation kinetics

被引：38

作者：

Rao, S. S. ^{[1
,2
]}

Stesmans, A. ^{[1
,2
]}

Keunen, K. ^{[1
,2
]}

Kosynkin, D. V. ^{[3
]}

Higginbotham, A. ^{[3
]}

Tour, J. M. ^{[3
,4
,5
]}

机构：

[1] Katholieke Univ Leuven, Dept Phys, B-3001 Louvain, Belgium

[2] Katholieke Univ Leuven, INPAC Inst Nanoscale Phys & Chem, B-3001 Louvain, Belgium

[3] Rice Univ, Dept Chem, Houston, TX 77005 USA

[4] Rice Univ, Dept Mech Engn & Mat Sci, Houston, TX 77005 USA

[5] Rice Univ, Smalley Inst Nanoscale Sci & Technol, Houston, TX 77005 USA

来源：

APPLIED PHYSICS LETTERS | 2011年 / 98卷 / 08期

关键词：

GAS MOLECULES; CARBON; DEFECTS; ADSORPTION;

D O I：

10.1063/1.3559229

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Electron spin resonance study of unzipped graphene nanoribbons (GNRs) reveals a specific carbon-related signal, denoted G(C), at g=2.0032, attributed to GNRs periphery centers. The signal is observed to be readily quenched upon O-2 adsorption, which appears to be fully reversible upon room temperature vacuum treatment. Its depassivation behavior, observed from 130 K onward, is well described by first-order kinetics, characterized by the dissociation energy of 0.58 +/- 0.04 eV of spread 0.11 +/- 0.02 eV. The G(C) signal is not sensitive to other gases, such as H-2, He, N-2, and Ar, pointing to a G(C)-O-2 physisorption interaction unique for GNRs, in agreement with theoretical insight. The G(C) center thus emerges as a highly selective, sensitive, and reversible O-2 sensor. (C) 2011 American Institute of Physics. [doi: 10.1063/1.3559229]

引用

页数：3

共 19 条

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